Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: qual classe está Braxton Kelley?
 ###Tabelas: CREATE TABLE regular_home_and_away_season (regular_home_and_away_season_id AUTO_INCREMENT PRIMARY KEY, Round INT, Date VARCHAR, Opponent VARCHAR, Home/Away VARCHAR, Score (Collingwoods score is in bold) VARCHAR, Result (includes margin) VARCHAR, Venue VARCHAR, Position on Ladder VARCHAR) CREATE TABLE doubles:_24_12–12 (doubles:_24_12–12_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Surface VARCHAR, Partnering VARCHAR, Opponents in the final VARCHAR, Score VARCHAR) CREATE TABLE previous_clubs (previous_clubs_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Nickname VARCHAR, Years in Competition VARCHAR, No. of Premierships INT, Premiership Years VARCHAR) CREATE TABLE roster (roster_id AUTO_INCREMENT PRIMARY KEY, Position VARCHAR, Number VARCHAR, Name VARCHAR, Height VARCHAR, Weight VARCHAR, Class VARCHAR, Hometown VARCHAR, Games↑ INT) CREATE TABLE first_class_record_partnerships_by_wicket (first_class_record_partnerships_by_wicket_id AUTO_INCREMENT PRIMARY KEY, Wicket VARCHAR, Runs VARCHAR, Batting partners VARCHAR, Batting team VARCHAR, Fielding team VARCHAR, Venue VARCHAR, Season VARCHAR)  
SELECT COUNT Class FROM roster WHERE Name = Braxton Kelley